1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
use "core"
compile [@, me] to: Lua value "self"
compile [as %instance %body] to
Lua ".."
do
local self = \(%instance as lua expr);
local global_actions = ACTIONS;
local ACTIONS = setmetatable({}, {__index=function(_,key)
local method = self[key];
if method then return (function(...) return method(self, ...); end); end
return global_actions[key];
end});
\(%body as lua statements)
end
compile [object %classname %class_body] to
%class_id <- (=lua "Var.as_lua_id({value=\(%classname as value)}):sub(2,-1)")
if: %class_id is ""
%class_id <- "class"
%methods <-: Lua ""
%__index <- %class_id
%__newindex <- "nil"
for %line in %class_body.value
if: %line.type is "Comment"
do next %line
if: (%line.type is "Action") and ((%line's stub) is "slots %")
%slot_index_clauses <- []
%slot_newindex_clauses <- []
%slots <- %line.value.2
for %slot_index = %slot_var in %slots.value
to %slot_index_clauses add ".."
if key == \(repr %slot_var.value) or key == \(repr (%slot_var as lua expr)) then
return rawget(self, \%slot_index);
end
to %slot_newindex_clauses add ".."
if key == \(repr %slot_var.value) or key == \(repr (%slot_var as lua expr)) or key == \%slot_index then
rawset(self, \%slot_index, value);
end
%__index <- ".."
function(self, key)
\(%slot_index_clauses joined with "\n")
return \%class_id[key];
end
%__newindex <- ".."
function(self, key, value)
\(%slot_newindex_clauses joined with "\n")
error("Attempt to store data in "..repr(key)..", which is not a valid slot on "..tostring(self.class));
end
do next %line
assume ((%line.type is "Action") and ((%line's stub) is "action % %"))
..or barf "Only action definitions are supported inside 'object % %'"
%actions <- %line.value.2
%body <- %line.value.3
lua> ".."
do
local stubs = {}
for i, action in ipairs(\%actions.value) do
stubs[i] = action:get_stub(true)
end
local lua = Lua(\(%line.source), \%class_id, "[ ", repr(stubs[1]), "] = function(self")
local args = {}
for i,tok in ipairs(\%actions[1]) do
if tok.type == "Var" then args[#args+1] = tok end
end
for i, arg in ipairs(args) do
lua:append(", ", nomsu:tree_to_lua(arg))
end
local body_lua = nomsu:tree_to_lua(\%body):as_statements("return ")
body_lua:remove_free_vars(args)
body_lua:declare_locals()
lua:append(")\n ", body_lua, "\nend;\n")
\%methods:append(lua)
end
return
Lua ".."
do -- \%class_id
-- Create the class object
local \%class_id = setmetatable({
name=\(%classname as lua expr), instances=setmetatable({}, {__mode="k"}),
}, {
__tostring=function(c) return c.name; end,
__call=function(cls, initial_values)
local inst = setmetatable({}, cls.instance_metatable);
for k,v in pairs(initial_values) do inst[k] = v; end
cls.instances[inst] = true;
if inst['set % up'] then
inst['set % up'](inst);
end
return inst;
end,
});
\%class_id.class = \%class_id;
-- Define the methods
\%methods
-- Define class methods for instantiating and accessing instances
\%class_id.instance_metatable = {
__index=\%__index,
__newindex=\%__newindex,
__tostring=\%class_id['as text'] or function(inst)
return "<"..inst.class.name..": "..nomsu.ids[inst]..">";
end,
__len=\%class_id['size of'],
__unm=\%class_id['-'],
__add=\%class_id['+ %'],
__sub=\%class_id['- %'],
__mul=\%class_id['* %'],
__div=\%class_id['/ %'],
__mod=\%class_id['wrapped around %'],
__pow=\%class_id['^ %'],
__band=\%class_id['AND %'],
__bor=\%class_id['OR %'],
__bxor=\%class_id['XOR %'],
__bshl=\%class_id['<< %'],
__bshr=\%class_id['>> %'],
__eq=\%class_id['= %'],
__lt=\%class_id['< %'],
__le=\%class_id['<= %'],
};
nomsu:define_action("instances of "..\%class_id.name, function()
return utils.keys(\%class_id.instances);
end);
nomsu:define_action("new "..\%class_id.name.." %instance", function(_instance)
return \%class_id(_instance);
end);
nomsu:define_action("new "..\%class_id.name, function()
return \%class_id({});
end);
end -- End of definition of \%class_id
\("\n\n")
|
